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Guideline: 1. Explain the principle of echo location and how this is applied to the examination of internal body structures. 2. Conduct an analysis using an advanced level of scientific understanding and terminology from wider reading A simplified cross-section of a human body and an ultrasound transducer is shown below. 1a) Fully explain what happens to the ultrasound signal as it travels from the probe through the body. 1b) Sketch a graph (intensity of the signal detected by the probe) varies with time following the transmission of a pulse of ultrasound with the probe in this position